Based on reader feedback, I decided to take a look at usernames submitted to honeypots. The usernames that are seen on a daily basis look very familiar. They tend to come from default user accounts, such as “administrator” on Windows systems or ”root” on Linux systems. The knowledge of a default user account can help in brute force attacks. If the username is already known, only the password needs to be guessed. This shouldn't be too much of a problem to users as long as strong passwords are chosen or other authentication methods such as public key authentication is used. Setting up public key authentication is also referenced in our DShield setup instructions for a Raspberry Pi [2]. 
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